Learning words...
I'm using a nice little application called Supermemo for memorizing words.
It uses the concept of "leech". A leech is a word you cannot memorize, it keeps nagging you as you fail to recognize it over and over again.

Here are some my leeches, i.e. Portuguese words or expressions that keep eluding me:

- afastar
- dar-se por
- colher f (I'm mystified about this one)
- foragir-se
- devido a
 - aproveite
- amedrontador
- pelo que me toca
- quadra coberta
- importar-se com algo
- tocar á campainha
- sítio m

This is my Dirty Dozen. As you can see, there is no logic whatsoever in why I find it difficult to learn these words. Perhaps, now that I have written them down, it will help.